<template>
  <div class="todo-footer" v-show="total">
      <label>
<!--          <input type="checkbox" :checked="ischeckedall" @change="checkedalltodos">-->
          <input type="checkbox" v-model="ischeckedall" >
      </label>
      <span>
          <span>已完成{{doneTotal}}</span>/全部{{total}}
      </span>
      <button class="btn btn-danger" @click="deleteall">清楚已完成任务</button>
  </div>
</template>

<script>
export default {
  name: "MyFooter",
  props:['todos'],

  computed:{

    total(){
      return this.todos.length
    },
    doneTotal(){
      // let a=0
      //   this.todos.forEach((todo)=>{
      //     if(todo.done==true) a++})
      // return a;

      // let x = this.todos.reduce((pre,todo)=>{
      //   console.log("@@@",pre,todo)
      //   return pre + (todo.done? 1:0)
      // },0)
      // return x

      //简写
      return this.todos.reduce((pre,todo)=>pre +(todo.done? 1:0),0)
    },
    ischeckedall:{
      get(){
        return this.total==this.doneTotal && this.total>0
      },
      set(value){
        this.$emit('checkedalltd',value)
      }
    }

  },
  methods:{
    //全选
    // checkedalltodos(e){
    //   //告诉app组件选中所有todo
    //   console.log(e.target.checked)
    //   this.checkedalltd(e.target.checked)
    // }
    //清楚所有完成
    deleteall(){
      console.log("111")
      this.$emit('deletealltodo')

    }
  }

}
</script>

<style scoped>
  .todo-footer{
    height: 40px;
    line-height: 40px;
    padding-left: 6px;
    margin-top: 5px;
  }
  .todo-footer label{
    display: inline-block;
    margin-right: 20px;
    cursor: pointer;
  }
  .todo-footer label input{
    position: relative;
    top: -1px;
    vertical-align: middle;
    margin-right: 5px;
  }
  .todo-footer button{
    float: right;
    margin-top: 5px;
  }
</style>